| Zugriffsnummer | 48486 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | The probe-format graphite calorimeter, Aerrow, for absolute dosimetry in ultra-high pulse dose rate electron beams |
| Autor(in); Institution |
Bourgouin, Alexandra; 6.2, Dosimetrie für Strahlentherapie und Röntgendiagnostik, PTB-Braunschweig
Keszti, Federico; Medical Physics Unit, McGill University, Montreal, Quebec, CANADA
Schönfeld, Andreas; Research, Sun Nuclear, A Mirion Medical Company, Melbourne, Florida, USA
Hackel, Thomas; 6.2, Dosimetrie für Strahlentherapie und Röntgendiagnostik, PTB-Braunschweig
Kozelka, Jakub; Research, Sun Nuclear, A Mirion Medical Company, Melbourne, Florida, USA
Hildreth, Jeff; Research, Sun Nuclear, A Mirion Medical Company, Melbourne, Florida, USA
Simon, William; Research, Sun Nuclear, A Mirion Medical Company, Melbourne, Florida, USA
Schüller, Andreas; 6.2, Dosimetrie für Strahlentherapie und Röntgendiagnostik, PTB-Braunschweig
Kapsch, Ralf-Peter; 6.2, Dosimetrie für Strahlentherapie und Röntgendiagnostik, PTB-Braunschweig
Renaud, James; Medical and Industrial Dosimetry, National Research Council of Canada (NRC), Ottawa, Ontario, CANADA
|
| Quelle/Jahr | Medical Physics: 49 (2022), 10, 6635 - 6645 |
| ISSN | 0094-2405 (PRINT) ; 2473-4209 (ONLINE) |
| DOI | |
| Verlag | Hoboken, NJ: Wiley |
| Freie Schlagworte | Calorimeter ; Ultra-high dose per pulse ; Electron beam ; FLASH ; Dosimetry |
| Zusammenfassung | Purpose: The purpose of this investigation is to evaluate the use of a probe-format graphite calorimeter, Aerrow, as an absolute and relative dosimeter of high-energy pulse dose rate (UHPDR) electron beams for in-water reference and depth-dose type measurements, respectively. Methods: In this paper, the calorimeter system is used to investigate the potential influence of dose per pulses delivered up to 5.6 Gy, the number of pulses delivered per measurement and its potential for relative measurement (depth dose curve measurement). The calorimeter system is directly compared against an Advanced Markus ion chamber. The finite element method was used to calculate heat transfer corrections along the percentage depth dose of a 20 MeV electron beam. Monte Carlo-calculated dose conversion factors necessary to calculate absorbed dose to-water at a point from the measured dose-to-graphite are also presented. Results: The comparison of Aerrow against a fully calibrated Advanced Markus chamber, corrected for the saturation effect, has shown consistent results in terms of dose to water determination. The measured reference depth is within 0.5 mm from the expected value from Monte Carlo simulation. The relative standard uncertainty estimated for Aerrow was 1.06%, which is larger compared to alanine dosimetry (McEwen et al. doi:10.1088/0026-1394/52/2/272) but has the advantage of being a real time detector. Conclusion: In this investigation, it was demonstrated that the Aerrow probe-type graphite calorimeter can be used for relative and absolute dosimetry in water in an UHPDR electron beam. To the author’s knowledge, this is the first reported use of an absorbed dose calorimeter for an in-water percentage depth dose curve measurement. The use of the Aerrow in quasi-adiabatic mode has greatly simplified the signal readout, compared to isothermal mode, as the resistance was directly measured with a high-stability Digital-Multimetre (DMM). |
| Kostenfreier Zugang | Open Access Hybrid |
| Rechteinformation | CC BY 4.0 ; Creative Commons Attribution 4.0 License |
| Forschungsprojekt | 18HLT04: UHDpulse: Metrology for advanced radiotherapy using particle beams with ultra-high pulse dose rates |
| Förderinformationen (1) |
Förderername: European Commission (EC)
Förderer ID: 0000 0001 2242 8989 Förderer ID Typ: ISNI Förderprogramm: EMPIR 2018 Health Titel der Förderung: 18HLT04: UHDpulse: Metrology for advanced radiotherapy using particle beams with ultra-high pulse dose rates Förderungsnummer: 18HLT04 |
Zitierung
Bourgouin, A., Keszti, F., Schönfeld, A., Hackel, T., Kozelka, J., Hildreth, J., Simon, W., Schüller, A., Kapsch, R.-P., & Renaud, J. (2022). The probe-format graphite calorimeter, Aerrow, for absolute dosimetry in ultra-high pulse dose rate electron beams. Medical Physics, 49(10), 6635–6645. https://doi.org/10.1002/mp.15899